package com.hzbank.generate.config;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

@Slf4j
@Configuration
//@ConfigurationProperties
//@EnableAsync // 开启多线程
public class AsyncConfiguration {
    @Value("${async.executor.thread.core_pool_size}")
    private int corePoolSize;
    @Value("${async.executor.thread.max_pool_size}")
    private int maxPoolSize;
    @Value("${async.executor.thread.queue_capacity}")
    private int queueCapacity;
    @Value("${async.executor.thread.name.prefix}")
    private String namePrefix;

    @Bean("doExecutor")
    public Executor doSomethingExecutor() {
        log.info("---创建线程池---");
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        // 核心线程数：线程池创建时候初始化的线程数
        executor.setCorePoolSize(corePoolSize);
        // 最大线程数：线程池最大的线程数，只有在缓冲队列满了之后才会申请超过核心线程数的线程
        executor.setMaxPoolSize(maxPoolSize);
        // 缓冲队列：用来缓冲执行任务的队列
        executor.setQueueCapacity(queueCapacity);
        // 允许线程的空闲时间60秒：当超过了核心线程之外的线程在空闲时间到达之后会被销毁
        executor.setKeepAliveSeconds(60);
        // 线程池名的前缀（线程名）：
        executor.setThreadNamePrefix(namePrefix);
        // 缓冲队列满了之后的拒绝策略：由调用线程处理（一般是主线程）
        //executor.setRejectedExecutionHandler(new ThreadPoolExecutor.AbortPolicy());//默认 丢弃任务并抛出RejectedExecutionException异常
        //executor.setRejectedExecutionHandler(new ThreadPoolExecutor.DiscardPolicy());//丢弃任务，但是不抛出异常
        //executor.setRejectedExecutionHandler(new ThreadPoolExecutor.DiscardOldestPolicy());//丢弃队列最前面的任务，然后重新提交被拒绝的任务
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());//由调用线程（提交任务的线程）处理该任务 循环多用此可以跑完
        //初始化线程池
        executor.initialize();
        return executor;
    }
}
